研究目的
The problem concerning the diagnostics of the phase composition of lead-zirconate-titanate (PZT) films under conditions of overlapping Raman spectra is solved via applied mathematical statistics.
研究成果
Raman spectroscopy is a promising method for analyzing the phase composition of materials. Raman spectra measured on the surface of lead-zirconate-titanate layers, as well as the spectra of standard specimens of probable phases, have been employed to create different sets whereby the proposed phase-identification method based on comparison spectra is verified. On account of distortions observed in Raman spectra, phases are identified in different spectral regions. It is ascertained that phase identification and their concentration determination must be performed using the spectral region for which the first principal components, which correspond to the initial spectral range of the set of Raman spectra under consideration, are most different from each other.
研究不足
The spectral range of 95–120 cm–1 turned out to be unsuitable for concentration calculations due to the absence of the Raman peaks of perovskite and pyrochlore phases. A spectral range of 55–95 cm–1 (60–83 cm–1) turned out to be uninformative, making it impossible to distinguish between perovskite and pyrochlore phases because the spectra of the standard specimens of the given phases resembled each other.
